The logging inside SymbolTable::unlink() and SymbolTable::possibly_parallel_unlink() is guarded by Verbose and WizardMode, which are both develop flags. This means that the log output is not available in product builds. So, this logging is most likely just leftover debugging code.

In the GC team we don't use this logging (even though it is for some reason guarded by PrintGCDetails too) and I discussed it with Coleen and Rachel in the Runtime team. The Runtime team also don't use the logging.

It is pretty straight forward to add this logging back if it is ever needed for a debugging session. Until then we should remove this from the code base.